Ultrasonic measurement simulation test device for thickness of cylinder oil film in working process of diesel engine

Abstract

The purpose of the invention is to provide an ultrasonic measurement simulation test device for the thickness of a cylinder oil film in the working process of a diesel engine. A motor is connected with a crankshaft through a shaft coupling. A top dead center sensor and a position sensor are installed on the crankshaft. One end of an oiling system is connected with a display and controller. The other end of the oiling system valve communicates with a combustion chamber above a piston via a one-way valve. The combustion chamber is provided therein with a heater connected with the display and controller. The outer wall of a cylinder liner is provided with a transducer. The transducer is connected with a multiplexing switch. The multiplexing switch is successively connected with a signal amplifier, a pulse generator / receiver, a data acquisition unit, and the display and controller. A temperature sensor and a pressure sensor are installed in the cylinder liner over the combustion chamber. The temperature sensor, the pressure sensor, the top dead center sensor and the position sensor are connected to the data acquisition unit. The ultrasonic measurement simulation test device can not only measure the change of the oil film during the movement of the cylinder piston, but also can simulate the movement process of the diesel engine so as to realize a ultrasonic measurement simulation test of the thickness of the cylinder oil film in the working process of the diesel engine.

Description

technical field [0001] The invention relates to a simulation test device, in particular to a simulation test device for the oil film thickness of a diesel engine cylinder. Background technique [0002] Marine diesel engine cylinders have high working pressure, high temperature, difficult lubrication and harsh working conditions, so cylinder lubrication is one of the main factors affecting the work of diesel engines. Statistics show that failures caused by lubrication account for 40% of the total failures. During the operation of the diesel engine, due to the high pressure between the cylinder wall and the piston ring, the large load impact and the linear velocity between the surfaces, the oil film becomes very thin and easily damaged, making the contact surface in a state of dry friction, and the temperature of the contact surface rises significantly. The high temperature and wear are obviously aggravated, and eventually the engine cannot work normally, and in severe cases,...

AI Technical Summary

Problems solved by technology

[0003] The electrical method requires a conductive plane or a completely electrically isolated contact unit to install the sensor. The main disadvantage of the optical method is that one of the two contact bodies must be made of transparent materials. During measurement, this requires the entity in contact with the oil film to be transparent. Or there is a window for transmitting light beams on the entity, which is quite different from the actual working conditions of mechanical parts

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